318 WATER STORAGE AND CANALIZATION, 
The plains of Lombardy are intersected by no fewer than 
twelve large many of which are navigable and have 
affording some basis on which we may estimate theadvantagesof such 
s inthis country. Its main canal, which is 30 miles long, has 
a sectional area of 604 square feet, and was constructed at & 
cost of £215,516. The whole scheme, embracing besides the 
main canal two large canals, 143 and 181 miles long respectively, 
gth of 132 
and 
miles, and all headworks, &c., cost £880,000. Its returns per 
annum, so that its clear profit is £66,000, which represents 1} 
intere is estimated that in forty years it ¥ 
return £1,280,000, which will cover the cost of its construction 
and mainte: It was executed by a small company of iol 
shareholders in 1872, for the purpose of irrigating a very dry ae 
: : on 
459,166. The country has a general uniform fall of “75 of a foot 
u 
The profit per acre is estimated as follows :— 
of Profit 
oy peta Total. sree of org 
4 : produce. nn 
- oon ? 
For sandy soil .........} 10/8 6/3 16/11 28 6 : 
Por clay sol ok 5 3 13/8 2277 - 3 
Mitac aaa 9/ os | mys | 2 4:8} * 
SRNR eee 
The indirect advantages of irrigation are also considerable, a8 
reduces the labour of ploughing, hoeing, and harrowing. | , 479 
The complete scheme will irrigate 190,690 acres gee : 
cubic feet per second out of the 2,825 cubic feet of full SUPP. 
At the same proportion it would irrigate, toge uare 
remaining supply of 353 cubic feet, 217,930 acres, or 340 84 
miles, at a cost of about £2,600 per square mile. 
